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Gen 1 Minimum Levels (Glitchless)

This is a list of the lowest level at which you can obtain every Pokémon in Red, Green, Blue, or Yellow. It does not contain levels attainable via the Mew Glitch. However, it does assume you have access to all Gen 1 games, Gen 2 games, Pokémon Stadium, and a method of obtaining a level 5 Mew.
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Gen 1 Minimum Levels (Glitchless) (Japanese)

Pokémon		Level	Method of Obtaining
	Bulbasaur	5	Obtain as a Gift in Professor Oak's Lab in Red, Green, or Blue. Breed in Gold, Silver, or Crystal. Obtain as a Gift in Pokémon Stadium.
	Ivysaur	16	Evolve Bulbasaur.
	Venusaur	32	Evolve Ivysaur.
	Charmander	5	Obtain as a Gift in Professor Oak's Lab in Red, Green, or Blue. Breed in Gold, Silver, or Crystal. Obtain as a Gift in Pokémon Stadium.
	Charmeleon	16	Evolve Charmander.
	Charizard	36	Evolve Charmeleon.
	Squirtle	5	Obtain as a Gift in Professor Oak's Lab in Red, Green, or Blue. Breed in Gold, Silver, or Crystal. Obtain as a Gift in Pokémon Stadium.
	Wartortle	16	Evolve Squirtle.
	Blastoise	36	Evolve Wartortle.
	Caterpie	3	Catch by walking in Viridian Forest in Red, Green, Blue, or Yellow. Catch by walking in Route 2 in Green, Blue, Gold (Morning and Day only), or Crystal (Morning and Day only). Catch by walking in Route 30 in Gold (Morning and Day only) or Crystal (Morning and Day only).
	Metapod	4	Catch by walking in Viridian Forest in Red, Green, Blue, or Yellow. Catch by walking on Route 30 in Gold (Morning and Day only).
	Butterfree	7	Catch by walking on Route 2 in Gold (Morning only) or Crystal (Morning and Day only).
	Weedle	3	Catch by walking in Viridian Forest in Red, Green, or Blue. Catch by walking on Route 2 in Red or Silver (Morning and Day only). Catch by walking on Route 30 in Silver (Morning and Day only) or Crystal (Morning and Day only).
	Kakuna	4	Catch by walking in Viridian Forest in Red, Green, or Blue. Catch by walking on Route 30 in Silver (Morning and Day only).
	Beedrill	7	Catch by walking on Route 2 in Silver (Morning only).
	Pidgey	2	Catch by walking on Route 1 in Red, Green, Blue, Yellow, Gold (Morning and Day only), Silver (Morning and Day only), or Crystal (Morning and Day only). Catch by walking on Route 29 in Gold (Morning and Day only), Silver (Morning and Day only), or Crystal (Morning and Day only). Catch by walking on Route 30 in Gold (Morning and Day only) or Silver (Day only).
	Pidgeotto	7	Catch by walking on Route 2 in Gold (Morning and Day only), Silver (Day only), or Crystal (Day only).
	Pidgeot	36	Evolve Pidgeotto.
	Rattata	2	Catch by walking on Route 1 in Red, Green, Blue, Yellow, Gold, Silver, or Crystal. Catch by walking on Route 2 or 22 in Red, Green, or Blue. Catch by walking on Route 29 in Gold (Night only), Silver (Night only), or Crystal. Catch by walking on Route 46 in Gold, Silver, or Crystal.
	Raticate	6	Catch by walking on Route 1 in Crystal (Night only).
	Spearow	2	Catch by walking on Route 22 in Yellow. Catch by walking on Route 46 in Gold (Morning and Day only), Silver (Morning and Day only), or Crystal (Morning and Day only).
	Fearow	7	Catch by walking on Route 22 in Gold (Morning and Day only), Silver (Morning and Day only), or Crystal (Morning and Day only).
	Ekans	4	Catch by walking on Route 32 in Silver or Crystal (Morning and Day only).
	Arbok	10	Catch by walking on Route 3 or 4 in Silver or Crystal (Morning and Day only).
	Pikachu	3	Catch by walking in Viridian Forest in Red, Green, or Blue.
	Raichu	3	Evolve a Pikachu caught in Red, Green, or Blue.
	Sandshrew	5	Breed in Gold, Silver, or Crystal.
	Sandslash	10	Catch by walking in Mt. Moon in Gold.
	Nidoran♀	2	Catch by walking on Route 22 in Green or Yellow.
	Nidorina	16	Evolve Nidoran♀. Complete an in-game trade on Route 11 in Red or Green, trading a lv. 16 Nidorino obtained in Red, Green, Blue, Yellow, Gold, Silver, or Crystal.
	Nidoqueen	16	Evolve Nidorina.
	Nidoran♂	2	Catch by walking on Route 22 in Red, Blue, or Yellow. Complete an in-game trade in the Route 5-6 Underground Path in Red or Green, trading a level 2 Nidoran♀ caught in Green or Yellow.
	Nidorino	16	Evolve Nidoran♂.
	Nidoking	16	Evolve Nidorino.
	Clefairy	6	Breed a Cleffa in Gold, Silver, or Crystal, and raise it one level with appropriate happiness to evolve it. Catch by walking in Route 3 or 4 in Crystal (Night only).
	Clefable	6	Evolve a Clefairy obtained in Gold, Silver, or Crystal.
	Vulpix	5	Breed in Gold, Silver, or Crystal.
	Ninetales	5	Evolve a Vulpix bred in Gold, Silver, or Crystal.
	Jigglypuff	3	Catch by walking on Route 3 in Red, Green, or Blue. Catch by walking on Route 5 or 6 in Yellow. Catch by walking on Route 46 in Gold or Silver.
	Wigglytuff	3	Evolve a Jigglypuff caught in Red, Green, Blue, Yellow, Gold, or Silver.
	Zubat	2	Catch by walking in Dark Cave (Route 31/46 side) in Gold, Silver, or Crystal.
	Golbat	13	Catch by walking in Mt. Mortar (1F front) in Crystal.
	Oddish	5	Breed in Gold, Silver, or Crystal. Catch by walking in Ilex Forest in Gold (Night only), Silver (Night only), or Crystal (Night only).
	Gloom	14	Catch by walking on Route 24 in Crystal (Night only).
	Vileplume	14	Evolve a Gloom caught in Crystal.
	Paras	5	Breed in Gold, Silver, or Crystal.
	Parasect	5	Complete an in-game trade in Cinnabar Lab in Yellow, trading a level 5 Tangela bred in Gold, Silver, or Crystal or obtained via in-game trade in Red or Green.
	Venonat	5	Breed in Gold, Silver, or Crystal. Catch by walking in Ilex Forest in Crystal (Night only).
	Venomoth	10	Catch by walking on Route 24 or 25 in Gold (Night only) or Silver (Night only).
	Diglett	3	Catch by walking in Diglett's Cave in Crystal (Morning only).
	Dugtrio	5	Complete an in-game trade on Route 11 in Yellow, trading a level 5 Lickitung bred in Gold, Silver, or Crystal.
	Meowth	5	Breed in Gold, Silver, or Crystal.
	Persian	18	Catch by walking on Route 7 in Crystal (Night only).
	Psyduck	5	Breed in Gold, Silver, or Crystal. Catch by Surfing on Route 6 in Gold, Silver, or Crystal.
	Golduck	10	Catch by Surfing on Route 6 in Gold, Silver, or Crystal.
	Mankey	3	Catch on Route 22 in Yellow.
	Primeape	15	Catch on Route 9 in Gold.
	Growlithe	5	Breed in Gold, Silver, or Crystal. Catch on Route 36 in Crystal (Morning or Day only).
	Arcanine	5	Evolve a Growlithe obtained in Gold, Silver, or Crystal.
	Poliwag	2	Complete an in-game trade in the Route 5-6 Underground Path in Blue, trading a level 2 Rattata caught in Red, Green, Blue, or Yellow.
	Poliwhirl	10	Catch by Surfing in Viridian City or Route 22 in Gold, Silver, or Crystal.
	Poliwrath	10	Evolve a Poliwhirl caught in Gold, Silver, or Crystal.
	Abra	5	Breed in Gold, Silver, or Crystal. Purchase in the Goldenrod Game Corner in Crystal.
	Kadabra	15	Catch on Route 8 in Gold or Silver.
	Alakazam	15	Evolve a Kadabra caught in Gold or Silver.
	Machop	5	Breed in Gold, Silver, or Crystal. Complete an in-game trade in Goldenrod Department Store in Gold or Silver, trading a level 5 Drowzee bred in Gold, Silver, or Crystal. Complete an in-game trade in Goldenrod Department Store in Crystal, trading a level 5 Abra obtained in Gold, Silver, or Crystal.
	Machoke	5	Complete an in-game trade in the Route 5-6 Underground Path in Yellow, trading a level 5 Cubone bred in Gold, Silver, or Crystal.
	Machamp	5	Complete an in-game trade in the Route 5-6 Underground Path in Yellow, trading a level 5 Cubone bred in Gold, Silver, or Crystal.
	Bellsprout	3	Catch by walking on Route 31 in Gold or Silver.
	Weepinbell	12	Catch by walking on Route 24 in Gold (Morning and Day only) or Silver (Morning and Day only). Catch by walking on Route 25 in Gold or Silver.
	Victreebel	12	Evolve a Weepinbell caught in Gold or Silver.
	Tentacool	5	Catch by Surfing on Route 19, 20, or 21 in Red, Green, Blue, or Yellow. Catch by Fishing with the Super Rod on 17 in Red, Green, Blue, or Yellow. Catch by Fishing with the Super Rod on Route 12, 13, or 18 in Red, Green, or Blue. Breed in Gold, Silver, or Crystal.
	Tentacruel	20	Catch by Fishing with the Super Rod on Route 20 in Yellow. Catch by Surfing on Route 27, 32, 34, 40, or 41, New Bark Town, Cherrygrove City, Olivine City, Cianwood City, Union Cave (B2F), or Whirl Islands (Southwest Cave, B2F, and Lugia's Room) in Gold, Silver, or Crystal.
	Geodude	2	Catch by walking on Route 46 or Dark Cave (Route 31/46 side) in Gold, Silver, or Crystal.
	Graveler	15	Complete an in-game trade in Cinnabar Lab in Blue, trading a level 15 Kadabra caught in Gold or Silver.
	Golem	15	Complete an in-game trade in Cinnabar Lab in Blue, trading a level 15 Kadabra caught in Gold or Silver.
	Ponyta	5	Breed in Gold, Silver, or Crystal.
	Rapidash	14	Complete an in-game trade in Pewter City in Gold or Silver, trading a level 14 Gloom caught in Crystal.
	Slowpoke	5	Breed in Gold, Silver, or Crystal.
	Slowbro	15	Catch by Surfing on Route 12 or 13 in Yellow.
	Magnemite	5	Breed in Gold, Silver, or Crystal.
	Magneton	5	Breed a level 5 Lickitung in Gold, Silver, or Crystal, trade it to Yellow, complete an in-game trade on Route 11 for a level 5 Dugtrio, trade the Dugtrio to Crystal, and complete an in-game trade at the Power Plant.
	Farfetch'd	2	Complete an in-game trade in Vermilion City in Red or Green, trading a level 2 Spearow caught in Gold, Silver, Crystal, or Yellow. Complete an in-game trade in Vermilion City in Blue, trading a level 2 Pidgey caught in Red, Green, Blue, Yellow, Gold, Silver, or Crystal.
	Doduo	4	Catch by walking on Route 22 in Gold (Morning or Day only), Silver (Morning or Day only), or Crystal (Morning or Day only).
	Dodrio	10	Complete an in-game trade in Blackthorn City in Crystal, trading a level 10 female Dragonair caught in Gold, Silver, or Crystal.
	Seel	5	Breed in Gold, Silver, or Crystal.
	Dewgong	5	Complete an in-game trade in Cinnabar Lab in Yellow, trading a level 5 Growlithe obtained in Gold, Silver, or Crystal.
	Grimer	5	Breed in Gold, Silver, or Crystal.
	Muk	5	Complete an in-game trade in Cinnabar Lab in Yellow, trading a level 5 Kangaskhan bred in Gold, Silver, or Crystal.
	Shellder	5	Breed in Gold, Silver, or Crystal.
	Cloyster	5	Evolve a Shellder bred in Gold, Silver, or Crystal.
	Gastly	3	Catch by walking in Sprout Tower (2F and 3F) in Gold (Night only), Silver (Night only), or Crystal (Night only).
	Haunter	15	Catch by walking in Rock Tunnel (B1F) in Crystal (Night only).
	Gengar	15	Evolve a Haunter caught in Crystal.
	Onix	3	Complete an in-game trade in Violet City in Gold, Silver, or Crystal, trading a level 3 Bellsprout caught in Gold or Silver.
	Drowzee	5	Breed in Gold, Silver, or Crystal.
	Hypno	16	Catch by walking on Route 11 in Gold, Silver, or Crystal (Night only).
	Krabby	5	Breed in Gold, Silver, or Crystal. Complete an in-game trade in Cinnabar Lab in Blue, trading a level 5 Growlithe obtained in Gold, Silver, or Crystal.
	Kingler	15	Catch by Fishing with the Super Rod on Route 25 in Yellow.
	Voltorb	5	Breed in Gold, Silver, or Crystal. Complete an in-game trade in Olivine City in Gold, Silver, or Crystal, trading a level 5 Krabby obtained in Blue, Gold, Silver, or Crystal.
	Electrode	3	Complete an in-game trade in Cinnabar Lab in Red or Green, trading a level 3 Raichu evolved from a Pikachu caught in Red, Green, or Blue.
	Exeggcute	5	Breed in Gold, Silver, or Crystal.
	Exeggutor	5	Evolve an Exeggcute bred in Gold, Silver, or Crystal.
	Cubone	5	Breed in Gold, Silver, or Crystal.
	Marowak	12	Catch by walking in Rock Tunnel (1F) in Crystal (Morning and Day only).
	Hitmonlee	20	Obtain as a Gift from Pokémon Stadium. Evolve a Tyrogue in Gold, Silver, or Crystal.
	Hitmonchan	20	Obtain as a Gift from Pokémon Stadium. Evolve a Tyrogue in Gold, Silver, or Crystal.
	Lickitung	5	Breed in Gold, Silver, or Crystal.
	Koffing	5	Breed in Gold, Silver, or Crystal.
	Weezing	16	Catch by walking in Burned Tower (B1F) in Crystal.
	Rhyhorn	5	Breed in Gold, Silver, or Crystal.
	Rhydon	10	Complete an in-game trade in Cinnabar Lab in Yellow, trading a level 10 Golduck caught in Gold, Silver, or Crystal. Complete an in-game trade in Blackthorn City in Gold or Silver, trading a level 10 female Dragonair caught in Gold, Silver, or Crystal.
	Chansey	5	Breed in Gold, Silver, or Crystal.
	Tangela	5	Breed in Gold, Silver, or Crystal. Complete an in-game trade in Cinnabar Lab in Red or Green, trading a level 5 Venonat bred in Gold, Silver, or Crystal.
	Kangaskhan	5	Breed in Gold, Silver, or Crystal.
	Horsea	5	Catch by Fishing with the Super Rod on Route 11 or Vermilion City in Yellow. Breed in Gold, Silver, or Crystal.
	Seadra	20	Catch by Fishing with the Super Rod on Route 13 in Yellow. Catch by Surfing in Whirl Islands (Lugia's Room) in Gold, Silver, or Crystal.
	Goldeen	5	Catch by Fishing with the Super Rod on Route 6 or Celadon City in Yellow. Catch by Surfing on Route 4, 24, or 25, or Cerulean City in Gold, Silver, or Crystal. Breed in Gold, Silver, or Crystal.
	Seaking	10	Catch by Surfing on Route 4, 24, or 25, or Cerulean City in Gold, Silver, or Crystal.
	Staryu	5	Catch by Fishing with the Super Rod in Pallet Town in Yellow. Breed in Gold, Silver, or Crystal.
	Starmie	5	Evolve from a Staryu obtained in Yellow, Gold, Silver, or Crystal.
	Mr. Mime	3	Complete an in-game trade on Route 2 in Blue, trading a level 3 Jigglypuff caught in Red, Green, Blue, Yellow, Gold, or Silver.
	Scyther	5	Breed in Gold, Silver, or Crystal.
	Jynx	10	Complete an in-game trade in Cerulean City in Red or Green, trading a level 10 Poliwhirl caught in Gold, Silver, or Crystal.
	Electabuzz	15	Catch by walking on Route 15 in Gold or Silver.
	Magmar	14	Catch by walking in Burned Tower (B1F) in Gold (Morning or Night only) or Silver (Morning or Night only).
	Pinsir	5	Breed in Gold, Silver, or Crystal.
	Tauros	5	Breed in Gold, Silver, or Crystal.
	Magikarp	5	Catch by Fishing with the Old Rod in any Fishing location in Red, Green, Blue, or Yellow. Catch by Fishing with the Super Rod in the Safari Zone in Yellow. Purchase on Route 4 in Red, Green, Blue, or Yellow. Catch by Surfing on Route 45, Dark Cave (Route 31/46 side), or Blackthorn City in Gold, Silver, or Crystal. Breed in Gold, Silver, or Crystal.
	Gyarados	15	Catch by Fishing with the Super Rod in Fuchsia City in Yellow. Catch by Surfing in the Lake of Rage in Gold, Silver, or Crystal.
	Lapras	5	Breed in Gold, Silver, or Crystal.
	Ditto	10	Catch on Route 34 or 35 in Gold, Silver, or Crystal.
	Eevee	5	Breed in Gold, Silver, or Crystal.
	Vaporeon	5	Evolve an Eevee bred in Gold, Silver, or Crystal.
	Jolteon	5	Evolve an Eevee bred in Gold, Silver, or Crystal.
	Flareon	5	Evolve an Eevee bred in Gold, Silver, or Crystal.
	Porygon	5	Breed in Gold, Silver, or Crystal.
	Omanyte	5	Breed in Gold, Silver, or Crystal.
	Omastar	40	Evolve Omanyte.
	Kabuto	5	Breed in Gold, Silver, or Crystal.
	Kabutops	5	Evolve Omanyte.
	Aerodactyl	5	Breed in Gold, Silver, or Crystal. Complete an in-game trade on Route 14 in Gold, Silver, or Crystal, trading a level 5 Chansey bred in Gold, Silver, or Crystal.
	Snorlax	5	Breed in Gold, Silver, or Crystal.
	Articuno	50	Catch in the Seafoam Islands (B4F) in Red, Green, Blue, or Yellow.
	Zapdos	50	Catch in the Power Plant in Red, Green, Blue, or Yellow.
	Moltres	50	Catch in Victory Road (2F) in Red, Green, Blue, or Yellow.
	Dratini	5	Breed in Gold, Silver, or Crystal.
	Dragonair	10	Catch by Fishing with a Super Rod on Route 45 in Gold, Silver, or Crystal.
	Dragonite	55	Evolve Dragonair.
	Mewtwo	70	Catch in Cerulean Cave (B1F) in Red, Green, Blue, or Yellow.
	Mew	5	The only way to obtain Mew without glitches or hacking was to receive it in an event for a physical copy of Red, Green, Blue, Yellow, Gold, Silver, or Crystal between 1996 and 2002, or for the Virtual Console rerelease of Red, Green, Blue, and Yellow in 2016. In all known distributions, it was level 5.

Gen 1 Minimum Levels (Glitchless) (Western)

Pokémon		Level	Method of Obtaining
	Bulbasaur	5	Obtain as a Gift in Professor Oak's Lab in Red or Blue. Breed in Gold, Silver, or Crystal. Obtain as a Gift in Pokémon Stadium.
	Ivysaur	16	Evolve Bulbasaur.
	Venusaur	32	Evolve Ivysaur.
	Charmander	5	Obtain as a Gift in Professor Oak's Lab in Red or Blue. Breed in Gold, Silver, or Crystal. Obtain as a Gift in Pokémon Stadium.
	Charmeleon	16	Evolve Charmander.
	Charizard	36	Evolve Charmeleon.
	Squirtle	5	Obtain as a Gift in Professor Oak's Lab in Red or Blue. Breed in Gold, Silver, or Crystal. Obtain as a Gift in Pokémon Stadium.
	Wartortle	16	Evolve Squirtle.
	Blastoise	36	Evolve Wartortle.
	Caterpie	3	Catch by walking in Viridian Forest in Red, Blue, or Yellow. Catch by walking in Route 2 in Blue, Gold (Morning and Day only), or Crystal (Morning and Day only). Catch by walking in Route 30 in Gold (Morning and Day only) or Crystal (Morning and Day only).
	Metapod	4	Catch by walking in Viridian Forest in Red, Blue, or Yellow. Catch by walking on Route 30 in Gold (Morning and Day only).
	Butterfree	7	Catch by walking on Route 2 in Gold (Morning only) or Crystal (Morning and Day only).
	Weedle	3	Catch by walking in Viridian Forest in Red or Blue. Catch by walking on Route 2 in Red or Silver (Morning and Day only). Catch by walking on Route 30 in Silver (Morning and Day only) or Crystal (Morning and Day only).
	Kakuna	4	Catch by walking in Viridian Forest in Red or Blue. Catch by walking on Route 30 in Silver (Morning and Day only).
	Beedrill	7	Catch by walking on Route 2 in Silver (Morning only).
	Pidgey	2	Catch by walking on Route 1 in Red, Blue, Yellow, Gold (Morning and Day only), Silver (Morning and Day only), or Crystal (Morning and Day only). Catch by walking on Route 29 in Gold (Morning and Day only), Silver (Morning and Day only), or Crystal (Morning and Day only). Catch by walking on Route 30 in Gold (Morning and Day only) or Silver (Day only).
	Pidgeotto	7	Catch by walking on Route 2 in Gold (Morning and Day only), Silver (Day only), or Crystal (Day only).
	Pidgeot	36	Evolve Pidgeotto.
	Rattata	2	Catch by walking on Route 1 in Red, Blue, Yellow, Gold, Silver, or Crystal. Catch by walking on Route 2 or 22 in Red or Blue. Catch by walking on Route 29 in Gold (Night only), Silver (Night only), or Crystal. Catch by walking on Route 46 in Gold, Silver, or Crystal.
	Raticate	6	Catch by walking on Route 1 in Crystal (Night only).
	Spearow	2	Catch by walking on Route 22 in Yellow. Catch by walking on Route 46 in Gold (Morning and Day only), Silver (Morning and Day only), or Crystal (Morning and Day only).
	Fearow	7	Catch by walking on Route 22 in Gold (Morning and Day only), Silver (Morning and Day only), or Crystal (Morning and Day only).
	Ekans	4	Catch by walking on Route 32 in Silver or Crystal (Morning and Day only).
	Arbok	10	Catch by walking on Route 3 or 4 in Silver or Crystal (Morning and Day only).
	Pikachu	3	Catch by walking in Viridian Forest in Red or Blue.
	Raichu	3	Evolve a Pikachu caught in Red or Blue.
	Sandshrew	5	Breed in Gold, Silver, or Crystal.
	Sandslash	10	Catch by walking in Mt. Moon in Gold.
	Nidoran♀	2	Catch by walking on Route 22 in Blue or Yellow. Complete an in-game trade in the Route 5-6 Underground Path in Red or Blue, trading a level 2 Nidoran♂ caught in Red or Yellow.
	Nidorina	16	Evolve Nidoran♀. Complete an in-game trade in Route 11 in Red or Blue, trading a level 16 Nidorino evolved in Red, Blue, Yellow, Gold, Silver, or Crystal.
	Nidoqueen	16	Evolve Nidorina.
	Nidoran♂	2	Catch by walking on Route 22 in Red or Yellow.
	Nidorino	16	Evolve Nidoran♂.
	Nidoking	16	Evolve Nidorino.
	Clefairy	6	Breed a Cleffa in Gold, Silver, or Crystal, and raise it one level with appropriate happiness to evolve it. Catch by walking in Route 3 or 4 in Crystal (Night only).
	Clefable	6	Evolve a Clefairy obtained in Gold, Silver, or Crystal.
	Vulpix	5	Breed in Gold, Silver, or Crystal.
	Ninetales	5	Evolve a Vulpix bred in Gold, Silver, or Crystal.
	Jigglypuff	3	Catch by walking on Route 3 in Red or Blue. Catch by walking on Route 5 or 6 in Yellow. Catch by walking on Route 46 in Gold or Silver.
	Wigglytuff	3	Evolve a Jigglypuff caught in Red, Blue, Yellow, Gold, or Silver.
	Zubat	2	Catch by walking in Dark Cave (Route 31/46 side) in Gold, Silver, or Crystal.
	Golbat	13	Catch by walking in Mt. Mortar (1F front) in Crystal.
	Oddish	5	Breed in Gold, Silver, or Crystal. Catch by walking in Ilex Forest in Gold (Night only), Silver (Night only), or Crystal (Night only).
	Gloom	14	Catch by walking on Route 24 in Crystal (Night only).
	Vileplume	14	Evolve a Gloom caught in Crystal.
	Paras	5	Breed in Gold, Silver, or Crystal.
	Parasect	5	Complete an in-game trade in Cinnabar Lab in Yellow, trading a level 5 Tangela bred in Gold, Silver, or Crystal or obtained via in-game trade in Red or Blue.
	Venonat	5	Breed in Gold, Silver, or Crystal. Catch by walking in Ilex Forest in Crystal (Night only).
	Venomoth	10	Catch by walking on Route 24 or 25 in Gold (Night only) or Silver (Night only).
	Diglett	3	Catch by walking in Diglett's Cave in Crystal (Morning only).
	Dugtrio	5	Complete an in-game trade on Route 11 in Yellow, trading a level 5 Lickitung bred in Gold, Silver, or Crystal.
	Meowth	5	Breed in Gold, Silver, or Crystal.
	Persian	18	Catch by walking on Route 7 in Crystal (Night only).
	Psyduck	5	Breed in Gold, Silver, or Crystal. Catch by Surfing on Route 6 in Gold, Silver, or Crystal.
	Golduck	10	Catch by Surfing on Route 6 in Gold, Silver, or Crystal.
	Mankey	3	Catch on Route 22 in Yellow.
	Primeape	15	Catch on Route 9 in Gold.
	Growlithe	5	Breed in Gold, Silver, or Crystal. Catch on Route 36 in Crystal (Morning or Day only).
	Arcanine	5	Evolve a Growlithe obtained in Gold, Silver, or Crystal.
	Poliwag	3	Catch by walking on Route 22 in Crystal (Night only).
	Poliwhirl	10	Catch by Surfing in Viridian City or Route 22 in Gold, Silver, or Crystal.
	Poliwrath	10	Evolve a Poliwhirl caught in Gold, Silver, or Crystal.
	Abra	5	Breed in Gold, Silver, or Crystal. Purchase in the Goldenrod Game Corner in Crystal.
	Kadabra	15	Catch on Route 8 in Gold or Silver.
	Alakazam	15	Evolve a Kadabra caught in Gold or Silver.
	Machop	5	Breed in Gold, Silver, or Crystal. Complete an in-game trade in Goldenrod Department Store in Gold or Silver, trading a level 5 Drowzee bred in Gold, Silver, or Crystal. Complete an in-game trade in Goldenrod Department Store in Crystal, trading a level 5 Abra obtained in Gold, Silver, or Crystal.
	Machoke	5	Complete an in-game trade in the Route 5-6 Underground Path in Yellow, trading a level 5 Cubone bred in Gold, Silver, or Crystal.
	Machamp	5	Complete an in-game trade in the Route 5-6 Underground Path in Yellow, trading a level 5 Cubone bred in Gold, Silver, or Crystal.
	Bellsprout	3	Catch by walking on Route 31 in Gold or Silver.
	Weepinbell	12	Catch by walking on Route 24 in Gold (Morning and Day only) or Silver (Morning and Day only). Catch by walking on Route 25 in Gold or Silver.
	Victreebel	12	Evolve a Weepinbell caught in Gold or Silver.
	Tentacool	5	Catch by Surfing on Route 19, 20, or 21 in Red, Blue, or Yellow. Catch by Fishing with the Super Rod on 17 in Red, Blue, or Yellow. Catch by Fishing with the Super Rod on Route 12, 13, or 18 in Red or Blue. Breed in Gold, Silver, or Crystal.
	Tentacruel	20	Catch by Fishing with the Super Rod on Route 20 in Yellow. Catch by Surfing on Route 27, 32, 34, 40, or 41, New Bark Town, Cherrygrove City, Olivine City, Cianwood City, Union Cave (B2F), or Whirl Islands (Southwest Cave, B2F, and Lugia's Room) in Gold, Silver, or Crystal.
	Geodude	2	Catch by walking on Route 46 or Dark Cave (Route 31/46 side) in Gold, Silver, or Crystal.
	Graveler	23	Catch by walking on Route 45 in Gold, Silver, or Crystal.
	Golem	23	Evolve a Graveler caught in Gold, Silver, or Crystal.
	Ponyta	5	Breed in Gold, Silver, or Crystal.
	Rapidash	14	Complete an in-game trade in Pewter City in Gold or Silver, trading a level 14 Gloom caught in Crystal.
	Slowpoke	5	Breed in Gold, Silver, or Crystal.
	Slowbro	15	Catch by Surfing on Route 12 or 13 in Yellow.
	Magnemite	5	Breed in Gold, Silver, or Crystal.
	Magneton	5	Breed a level 5 Lickitung in Gold, Silver, or Crystal, trade it to Yellow, complete an in-game trade on Route 11 for a level 5 Dugtrio, trade the Dugtrio to Crystal, and complete an in-game trade at the Power Plant.
	Farfetch'd	2	Complete an in-game trade in Vermilion City in Red or Blue, trading a level 2 Spearow caught in Gold, Silver, Crystal, or Yellow.
	Doduo	4	Catch by walking on Route 22 in Gold (Morning or Day only), Silver (Morning or Day only), or Crystal (Morning or Day only).
	Dodrio	10	Complete an in-game trade in Blackthorn City in Crystal, trading a level 10 female Dragonair caught in Gold, Silver, or Crystal.
	Seel	5	Breed in Gold, Silver, or Crystal.
	Dewgong	5	Complete an in-game trade in Cinnabar Lab in Yellow, trading a level 5 Growlithe obtained in Gold, Silver, or Crystal.
	Grimer	5	Breed in Gold, Silver, or Crystal.
	Muk	5	Complete an in-game trade in Cinnabar Lab in Yellow, trading a level 5 Kangaskhan bred in Gold, Silver, or Crystal.
	Shellder	5	Breed in Gold, Silver, or Crystal.
	Cloyster	5	Evolve a Shellder bred in Gold, Silver, or Crystal.
	Gastly	3	Catch by walking in Sprout Tower (2F and 3F) in Gold (Night only), Silver (Night only), or Crystal (Night only).
	Haunter	15	Catch by walking in Rock Tunnel (B1F) in Crystal (Night only).
	Gengar	15	Evolve a Haunter caught in Crystal.
	Onix	3	Complete an in-game trade in Violet City in Gold, Silver, or Crystal, trading a level 3 Bellsprout caught in Gold or Silver.
	Drowzee	5	Breed in Gold, Silver, or Crystal.
	Hypno	16	Catch by walking on Route 11 in Gold, Silver, or Crystal (Night only).
	Krabby	5	Breed in Gold, Silver, or Crystal.
	Kingler	15	Catch by Fishing with the Super Rod on Route 25 in Yellow.
	Voltorb	5	Breed in Gold, Silver, or Crystal. Complete an in-game trade in Olivine City in Gold, Silver, or Crystal, trading a level 5 Krabby bred in Gold, Silver, or Crystal.
	Electrode	3	Complete an in-game trade in Cinnabar Lab in Red or Blue, trading a level 3 Raichu evolved from a Pikachu caught in Red or Blue.
	Exeggcute	5	Breed in Gold, Silver, or Crystal.
	Exeggutor	5	Evolve an Exeggcute bred in Gold, Silver, or Crystal.
	Cubone	5	Breed in Gold, Silver, or Crystal.
	Marowak	12	Catch by walking in Rock Tunnel (1F) in Crystal (Morning and Day only).
	Hitmonlee	20	Obtain as a Gift from Pokémon Stadium. Evolve a Tyrogue in Gold, Silver, or Crystal.
	Hitmonchan	20	Obtain as a Gift from Pokémon Stadium. Evolve a Tyrogue in Gold, Silver, or Crystal.
	Lickitung	5	Breed in Gold, Silver, or Crystal.
	Koffing	5	Breed in Gold, Silver, or Crystal.
	Weezing	16	Catch by walking in Burned Tower (B1F) in Crystal.
	Rhyhorn	5	Breed in Gold, Silver, or Crystal.
	Rhydon	10	Complete an in-game trade in Cinnabar Lab in Yellow, trading a level 10 Golduck caught in Gold, Silver, or Crystal. Complete an in-game trade in Blackthorn City in Gold or Silver, trading a level 10 female Dragonair caught in Gold, Silver, or Crystal.
	Chansey	5	Breed in Gold, Silver, or Crystal.
	Tangela	5	Breed in Gold, Silver, or Crystal. Complete an in-game trade in Cinnabar Lab in Red or Blue, trading a level 5 Venonat bred in Gold, Silver, or Crystal.
	Kangaskhan	5	Breed in Gold, Silver, or Crystal.
	Horsea	5	Catch by Fishing with the Super Rod on Route 11 or Vermilion City in Yellow. Breed in Gold, Silver, or Crystal.
	Seadra	20	Catch by Fishing with the Super Rod on Route 13 in Yellow. Catch by Surfing in Whirl Islands (Lugia's Room) in Gold, Silver, or Crystal.
	Goldeen	5	Catch by Fishing with the Super Rod on Route 6 or Celadon City in Yellow. Catch by Surfing on Route 4, 24, or 25, or Cerulean City in Gold, Silver, or Crystal. Breed in Gold, Silver, or Crystal.
	Seaking	10	Catch by Surfing on Route 4, 24, or 25, or Cerulean City in Gold, Silver, or Crystal.
	Staryu	5	Catch by Fishing with the Super Rod in Pallet Town in Yellow. Breed in Gold, Silver, or Crystal.
	Starmie	5	Evolve from a Staryu obtained in Yellow, Gold, Silver, or Crystal.
	Mr. Mime	3	Complete an in-game trade on Route 2 in Red or Blue, trading a level 5 Abra obtained in Gold, Silver, or Crystal.
	Scyther	5	Breed in Gold, Silver, or Crystal.
	Jynx	10	Complete an in-game trade in Cerulean City in Red or Blue, trading a level 10 Poliwhirl caught in Gold, Silver, or Crystal.
	Electabuzz	15	Catch by walking on Route 15 in Gold or Silver.
	Magmar	14	Catch by walking in Burned Tower (B1F) in Gold (Morning or Night only) or Silver (Morning or Night only).
	Pinsir	5	Breed in Gold, Silver, or Crystal.
	Tauros	5	Breed in Gold, Silver, or Crystal.
	Magikarp	5	Catch by Fishing with the Old Rod in any Fishing location in Red, Blue, or Yellow. Catch by Fishing with the Super Rod in the Safari Zone in Yellow. Purchase on Route 4 in Red, Blue, or Yellow. Catch by Surfing on Route 45, Dark Cave (Route 31/46 side), or Blackthorn City in Gold, Silver, or Crystal. Breed in Gold, Silver, or Crystal.
	Gyarados	15	Catch by Fishing with the Super Rod in Fuchsia City in Yellow. Catch by Surfing in the Lake of Rage in Gold, Silver, or Crystal.
	Lapras	5	Breed in Gold, Silver, or Crystal.
	Ditto	10	Catch on Route 34 or 35 in Gold, Silver, or Crystal.
	Eevee	5	Breed in Gold, Silver, or Crystal.
	Vaporeon	5	Evolve an Eevee bred in Gold, Silver, or Crystal.
	Jolteon	5	Evolve an Eevee bred in Gold, Silver, or Crystal.
	Flareon	5	Evolve an Eevee bred in Gold, Silver, or Crystal.
	Porygon	5	Breed in Gold, Silver, or Crystal.
	Omanyte	5	Breed in Gold, Silver, or Crystal.
	Omastar	40	Evolve Omanyte.
	Kabuto	5	Breed in Gold, Silver, or Crystal.
	Kabutops	5	Evolve Omanyte.
	Aerodactyl	5	Breed in Gold, Silver, or Crystal. Complete an in-game trade on Route 14 in Gold, Silver, or Crystal, trading a level 5 Chansey bred in Gold, Silver, or Crystal.
	Snorlax	5	Breed in Gold, Silver, or Crystal.
	Articuno	50	Catch in the Seafoam Islands (B4F) in Red, Blue, or Yellow.
	Zapdos	50	Catch in the Power Plant in Red, Blue, or Yellow.
	Moltres	50	Catch in Victory Road (2F) in Red, Blue, or Yellow.
	Dratini	5	Breed in Gold, Silver, or Crystal.
	Dragonair	10	Catch by Fishing with a Super Rod on Route 45 in Gold, Silver, or Crystal.
	Dragonite	55	Evolve Dragonair.
	Mewtwo	70	Catch in Cerulean Cave (B1F) in Red, Blue, or Yellow.
	Mew	5	The only way to obtain Mew without glitches or hacking was to receive it in an event for a physical copy of Red, Blue, Yellow, Gold, Silver, or Crystal between 1996 and 2002, or for the Virtual Console rerelease of Red, Blue, and Yellow in 2016. In all known distributions, it was level 5.